Re: Merge Files - "A serious internal error.....
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There is something going on, on your computer.
Please open one of the files that gives you the Serious Internal Error message and look at the very top line of the Family Tree Maker screen. What does it say? (The complete line)
When you see the "already in use", do an ALT+CTRL+DEL and see how many times Family Tree Maker is running.
Have you restarted your computer recently? Perhaps something hasn't closed down properly.